Journal
CHEMICAL ENGINEERING JOURNAL
Volume 454, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.140103
Keywords
Double oxide; Heterogeneous Fenton -like reaction; Persulfate; Solar energy; Singlet oxygen
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In this study, a series of Zn-Fe double oxides were synthesized and showed excellent catalytic performance towards the oxidation of various organic pollutants under visible light and peroxymonosulfate (PMS) coexistence.
The radical-based Fenton-like reaction quenching by various inorganic anions or high concentration of organic matters restrict the practical value in future industrial application. Contrarily, the nonradical-dominated system could efficiently overcome above limitations and achieve excellent catalytic capacity under a wide category of water matrixes. Herein, a series of Zn-Fe double oxides were successfully fabricated via calcination of Zn1-xFex-Fe Prussian blue analogues under ambient atmosphere. Under the coexistence of visible light and perox-ymonosulfate (PMS), Zn-Fe double oxides manifested excellent catalytic performance towards various organic pollutants oxidation with trace amount of iron leaching, and even showed superior contaminant decomposition efficiency under high concentration of organic matter and practical aqueous system. Confirmed by radical trapping experiment and electron paramagnetic resonance spectroscopy, the photo-induced electrons and holes can act as triggers to PMS activation and thereby transform reaction routes from radicals to singlet oxygen (1O2) -dominated nonradical pathway over the prepared Zn-Fe double oxides. This work provided new insights and comprehension into modulating radical and nonradical pathways of PMS-based advanced oxidation process for refractory contaminant oxidation via utilizing solar energy.
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